GRIT BRIDGE SCRAPER
Rectangular tanks are commonly used for sand removal in wastewater treatment
plants as in aerated and nonaerated systems. A scraper bridge removes sand, which
is settled down to the tank bottom. The bridge moves in both directions and scrapes
the sand to either one the end of tank. Alternatively, sand is removed to a sand
separator unit through airlift or submersible-type pumps. Sand is generally used to
remove organic matter. It is then collected within a container for disposal. Grit
bridges can be designed to scrape single, dual, triple and quadrant channels.
Accessories:
• Control panel
• Airlift pump
• feeding cable
• Scum skimmer
Bridge
It is constructed from standard or folded type profiles by welding. Walkway is
manufactured from galvanized grating. Hand railing of the bridge is made of
standard galvanized pipes and bolted to the bridge.
Drive unit
It is formed by a geared motor located in the middle of the moving bridge and two
drive wheels set at both ends. Each wheelset has one duty and one idle wheel.
Centrally located drive unit carries the movement to the drive wheels through the
horizontal shaft. For long bridges, two drive units are utilized at both ends. Rubber
wheels or steel wheels and rail combinations can be used for bridge tracking.
Bottom scraper system
The bottom scraper fixed to the bridge, are made of standard profiles and pipes.
Universal joint gives the flexibility to move when the scraper blade confronts an
obstacle. The rubber blade is located at the edge of the scraper. Rubber edge is
replaceable when it is worn out, through
bolted construction.
Grease removal system
If required, a grease removal system made of welded standard profiles and sheets is
provided to collect grease and discharge it to the grease trough.
